Licensed Granny Flat Builders in Dural — CDC, 60m², from $130K

A standard 60m² two-bedroom turnkey granny flat in Dural costs $130,000–$200,000 in 2026 under the SEPP (Housing) 2021 Complying Development pathway for Village Dural R2 lots connected to Sydney Water. Custom-designed builds run $180,000–$280,000. Add The Hills Shire Section 7.12 contributions — 0.5% of works for builds $100K–$200K, or 1% for builds over $200K (confirmed October 2020 plan) — typically $900–$2,500. The Dural-specific cost variable is on-site sewage management (OSSM): large lot properties in Middle Dural, Old Northern Road acreage and the Kenthurst fringe not connected to Sydney Water sewer must upgrade their septic or OSSM system — budget $15,000–$40,000* on top of the build. Compound with BAL premiums for bushfire-prone lots. Total all-in cost for an acreage CDC granny flat with OSSM and BAL-19: $200,000–$290,000.

The minimum lot size is 450m² under SEPP (Housing) 2021 for the fast CDC pathway — but for Dural this threshold is almost never the real constraint. The vast majority of Dural lots are 600m²–10,000m²+. The binding constraints are more commonly: The Hills DCP site coverage (60% total, 45% building footprint — check this on smaller R2 Village Dural blocks); OSSM system capacity for large lot acreage properties; BAL rating on bushfire prone land; and zone (E4 Environmental Living or RU4 Primary Production = CDC excluded regardless of lot size). Run the lot check at the NSW Planning Portal first, confirm your zone and coverage allowance, before contacting any builder.

Yes — but the OSSM system must be upgraded to handle the additional sewage load before CDC or DA approval. Adding a second dwelling increases effluent output, requiring either connection to the nearest Sydney Water sewer main or expansion of the existing OSSM system to NSW Health guidelines. Required steps: (1) Commission an Effluent Management Report (EMR) from a licensed environmental scientist ($800–$2,000*). (2) Submit the OSSM upgrade plan to The Hills or Hornsby Council for approval. (3) Install the upgraded or new system — septic tank upgrade, new aerated wastewater treatment system (AWTS), or extended absorption trenches ($15,000–$40,000* depending on soil conditions and system type). (4) Council inspection post-installation. Allow 4–8 weeks for this phase before CDC lodgement. This is the most commonly missed cost item in Dural granny flat quotes. If your builder hasn't asked about sewage disposal in the first conversation, they haven't worked much in this suburb.

The Hills Development Control Plan Part B Section 2 Residential (in force 6 May 2022) applies to all residential-zoned land in Dural within The Hills Shire. The key commercial controls for secondary dwellings: (1) Maximum total site coverage — all impervious surfaces including buildings, driveways, patios, pools and outbuildings — must not exceed 60% of lot area. (2) The dwelling building footprint specifically must not exceed 45% of lot area. Both controls are more permissive than Camden's 50% combined cap. On a 700m² Round Corner block with a 200m² house and 36m² garage (33.7% building footprint), a 60m² granny flat brings the footprint to 42.3% — within the 45% cap with room to spare. (3) Bushfire: all development on bushfire prone land must address NSW RFS Planning for Bushfire Protection 2019 requirements — BAL assessment mandatory. (4) Geotechnical appraisal required where The Hills LEP 2012 landslide risk maps identify the site. For properties in Hornsby Shire (parts of Dural 2158 and much of Middle Dural), the Hornsby DCP applies instead — confirm your council first.

Yes — always. Two pathways: Pathway 1 — Complying Development Certificate (CDC), issued by a private certifier in 10–20 business days. Available for R2 Low Density Residential and R5 Large Lot Residential zoned Dural lots that meet all SEPP (Housing) 2021 standards (450m²+, existing principal dwelling, no heritage listing, BAL-29 or lower, not flood-affected) AND comply with The Hills DCP Part B Section 2 (60% total coverage, 45% building footprint). Also requires OSSM system approval or Sydney Water Section 73 certificate before CDC issue. Pathway 2 — Development Application (DA), lodged with The Hills Shire or Hornsby Shire Council. Required for: E4 Environmental Living or RU4 Primary Production zoned lots (SEPP CDC excluded); BAL-40 or Flame Zone properties; heritage-listed properties or items along Old Northern Road; and any lot where certifier identifies a CDC standard cannot be met. Both pathways require a BASIX certificate, sewage disposal compliance (OSSM or S73), and HBCF insurance on the builder before deposit is paid.

Dural is significantly bushfire prone. The Hills Shire Bushfire Prone Land Maps — Sheet 7 (Dural, Kenthurst, Glenhaven) and Sheet 10 (Middle Dural, Kenthurst, Dural) — confirm extensive coverage across the suburb. BAL ratings common in Dural: BAL-12.5 and BAL-19 across Round Corner lots adjoining vegetated gullies and established gardens; BAL-29 on Dural's western acreage fringe near Galston Gorge, Berrilee Road, and the Kenthurst Category 1 bushland boundary; BAL-40 and BAL-FZ in exposed Middle Dural positions facing Category 1 vegetation. Construction cost premiums: BAL-12.5 +$1,500–$4,000*, BAL-19 +$3,000–$8,000*, BAL-29 +$8,000–$15,000*, BAL-40 +$15,000–$30,000* (non-combustible specification required). BAL-40 and BAL-FZ close the SEPP CDC pathway — DA only. Commission a BPAD BAL assessment ($500–$1,200) before engaging a builder or certifier. A BAL determined 5+ years ago should be reassessed — vegetation growth changes ratings.

End-to-end timeline depends heavily on lot conditions. Village Dural R2 (sewer-connected, BAL-LOW to BAL-19): approximately 5–7 months — 2–4 weeks design and BASIX, 10–20 business days CDC, 12–16 weeks construction. Acreage Dural R5 (OSSM-reliant): 8–12 months — add 4–8 weeks upfront for OSSM EMR, council approval of OSSM upgrade plan, and system installation before CDC lodgement. DA pathway (E4/RU4 zone, BAL-40, heritage): 12–18 months — add 14–24 weeks DA assessment on top of the design and construction phases. Common timeline extensions specific to Dural: BAL assessment delay (2–4 weeks if consultant backlogged), OSSM upgrade system backorder (4–8 weeks for AWTS components), Hornsby Council DA assessment where Hornsby applies (often longer than The Hills). Never plan an OSSM acreage granny flat for a tight timeline — the OSSM phase cannot be compressed.

It matters materially. Dural 2158 straddles two local government areas: most of the established Village Dural around Round Corner and Old Northern Road frontages falls within The Hills Shire Council; parts of Middle Dural and some rural parcels on the eastern and northern margins fall within Hornsby Shire Council. Both councils accept SEPP (Housing) 2021 CDC applications via private certifiers — council jurisdiction doesn't affect the CDC pathway directly. For DA applications, the relevant DCP is The Hills DCP Part B Section 2 (The Hills) or Hornsby DCP Chapter 3 (Hornsby). Contributions also differ: The Hills uses the confirmed S7.12 Plan (0.5%/$100K–$200K, 1%/>$200K); Hornsby has its own framework. The Section 10.7(2) certificate will specify which council you're in and which contributions plan applies. Don't assume based on suburb name alone — run the address check on the NSW Planning Portal first.

Yes — NSW law permits renting a secondary dwelling to any tenant including non-family members under a standard Residential Tenancy Act 2010 agreement. Typical 2-bedroom granny flat rents in Dural 2158 are estimated at $550–$700 per week* (Dural median house rent is approximately $950/week per CoreLogic March 2026; granny flat rentals proportionally lower). A turnkey 60m² CDC granny flat costing $185,000 returning $625 per week represents an approximately 17.5% gross rental yield on construction cost before holding costs. In a suburb where house prices average $2.5M, a granny flat is more often a household cost supplement or family accommodation play than a pure investment — the yield on the entire land value is around 1.3%. SEPP (Housing) 2021 prohibits subdivision — the granny flat cannot be sold separately. For OSSM-reliant properties, a separate occupancy increases sewage load and the property owner is legally responsible for maintaining an approved OSSM system for both dwellings.

Dural granny flat builders on Western Sydney Trades cover Dural 2158, Middle Dural 2158, Kenthurst 2156, Glenhaven 2156, Castle Hill 2154, West Pennant Hills 2125, Cherrybrook 2126, Arcadia 2159, Galston 2159, Berrilee 2159, Glenorie 2157, and Baulkham Hills 2153. All builders know The Hills DCP Part B Section 2 Residential controls, The Hills Section 7.12 Contributions Plan, OSSM system requirements for large lot properties, The Hills Shire Bushfire Prone Land Maps Sheets 7 and 10, E4/RU4 zone DA pathway requirements, and the dual LGA complexity of properties spanning The Hills and Hornsby councils. Submit a quote from any suburb for a two-business-hour match.